Chicago River, boat tour, daytime, sunny weather, blue sky, few white clouds, modern architecture, skyscrapers, Willis Tower, reflection in water, sailboats, yachts, seagulls flying overhead, city skyline, urban landscape, greenery along riverbanks, walking paths, benches, street lamps, steel bridges, riverwalk, tourists taking photos, vibrant city life, dynamic composition, low-angle shot, warm and soft ambient lighting.